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PCI: layerscape: Add function pointer for exit_from_l2()

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Since different SoCs require different sequences for exiting L2, let's add
a separate "exit_from_l2()" callback to handle SoC specific sequences.

Change ls_pcie_exit_from_l2() return value from void to int in order
to propagate errors. Return an error if the exit_from_l2() callback
fails in the resume flow.

Link: https://lore.kernel.org/r/20231204160829.2498703-2-Frank.Li@nxp.com
Signed-off-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Lorenzo Pieralisi <lpieralisi@kernel.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Acked-by: Roy Zang <Roy.Zang@nxp.com>
This commit is contained in:
Frank Li 2023-12-04 11:08:26 -05:00 committed by Lorenzo Pieralisi
parent b85ea95d08
commit 123971a193
1 changed files with 9 additions and 2 deletions
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11
drivers/pci/controller/dwc/pci-layerscape.c
View File

@ -39,6 +39,7 @@
struct ls_pcie_drvdata {
const u32 pf_off;
int (*exit_from_l2)(struct dw_pcie_rp *pp);
bool pm_support;
};
@ -125,7 +126,7 @@ static void ls_pcie_send_turnoff_msg(struct dw_pcie_rp *pp)
dev_err(pcie->pci->dev, "PME_Turn_off timeout\n");
}
static void ls_pcie_exit_from_l2(struct dw_pcie_rp *pp)
static int ls_pcie_exit_from_l2(struct dw_pcie_rp *pp)
{
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
struct ls_pcie *pcie = to_ls_pcie(pci);
@ -150,6 +151,8 @@ static void ls_pcie_exit_from_l2(struct dw_pcie_rp *pp)
10000);
if (ret)
dev_err(pcie->pci->dev, "L2 exit timeout\n");
return ret;
}
static int ls_pcie_host_init(struct dw_pcie_rp *pp)
@ -180,6 +183,7 @@ static const struct ls_pcie_drvdata ls1021a_drvdata = {
static const struct ls_pcie_drvdata layerscape_drvdata = {
.pf_off = 0xc0000,
.pm_support = true,
.exit_from_l2 = ls_pcie_exit_from_l2,
};
static const struct of_device_id ls_pcie_of_match[] = {
@ -247,11 +251,14 @@ static int ls_pcie_suspend_noirq(struct device *dev)
static int ls_pcie_resume_noirq(struct device *dev)
{
struct ls_pcie *pcie = dev_get_drvdata(dev);
int ret;
if (!pcie->drvdata->pm_support)
return 0;
ls_pcie_exit_from_l2(&pcie->pci->pp);
ret = pcie->drvdata->exit_from_l2(&pcie->pci->pp);
if (ret)
return ret;
return dw_pcie_resume_noirq(pcie->pci);
}